Section 88(5) in The Indian Electricity Rules, 1956
(5)Lines crossing trolley-wires .-In the case of a crossing over a trolley-wire the guarding shall fulfil the following conditions, namely:-(a)where there is only one trolley-wire, two guard-wires shall be erected as in diagram A;(b)where there are two trolley-wires and the distance between them does not exceed 40 cms, two guard-wires shall be erected as in diagram B;(c)where there are two trolley-wires and the distance between them exceeds 40 cms but does not exceed 1.2 metres, three guard-wires shall be erected as in diagram C;(d)where there are two trolley-wires and the distance between them exceeds 1.2 metres, each trolley-wire shall be separately guarded as in diagram D;(e)the rise of the trolley boom shall be so limited that if the trolley leaves the trolley-wire, it shall not foul the guard-wires; and(f)where a telegraph-line is liable to fall or be blown down upon an arm, stay-wire or span-wire, and so slide down upon a trolley-wire, guard hooks shall be provided to prevent such sliding.
